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When you think of couples' porn, you might not expect something quite like this. "An Open Invitation: A Real Swingers Party in San Francisco" is the story of a young couple whose marital sex life is busted wide open after a chance encounter with a very free-spirited couple. It's also an incredible showcase for a lifestyle that is frequently misunderstood, using real-life swingers and telling an authentic story about how swinging can improve couples' sex lives. Private Media presents this must-see installment of its relatively new Private Independent series.

Allison (Courteney Cox-Arquette lookalike India Summer) and Will (James Deen) get home from a party and find a fancy envelope in their mailbox. It's for the couple next door, so Will says he'll drop it in their mailbox tomorrow. For now, it's bedtime. Instead of their usual reading-in-bed routine, Allison decides she'd like to have sex, suggesting it in such a way that it sounds like the most unheard of thing ever. Will is surprised she wants it a second time that week, but happy to get it on. Unfortunately, it's over almost before it begins and when Allison turns out her bedside light, there is a definite look of wanting more on her face.

Meanwhile, Vivian (Lorelei Lee) and Adam (Mickey Mod) come home and have the kind of impassioned sex most couples dream about, incorporating some anal toy play and sex in both her pussy and her ass. And who needs a bed when you can spread out on the floor? Vivian uses a vibrator on her clit while anally riding Adam's cock in reverse cowgirl, and continues to use it when he fucks her ass in missionary later. There are a lot of camera angles that you don't see often enough in porn, capturing the eroticism of the moment in a way that the close-ups on penetration can't always manage to reveal on their own.

When Allison and Will have a date night, they run into Vivian and Adam at the restaurant. Vivian is keen to get acquainted with this uptight-seeming couple and Adam agrees, so they share a bottle of wine with them. With their tables pushed together, the two couples enjoy the sensual pleasures of food, wine, laughter, and a hookah. Vivian and Adam talk Allison and Will into joining them for a drink at the house of some of their friends afterward. Things turn awkward when it becomes apparent that the couples at the house are all very free and open. On the way to the bathroom, Allison finds an opened envelope that looks like the one she and Will got by mistake. She opens it and what she sees startles her, but not as much as seeing her hostess getting felt up when she leaves the bathroom. "Are you guys swingers?" Allison asks of Adam and the couple sitting on the couch with him as Vivian makes out with some other guy nearby. They prefer being described as "open."

As everyone around them gives in to their desires, eventually Allison and Will let Vivian ease them into that unfamiliar, sensual world. Will almost can't believe his eyes when he sees another beautiful woman licking his wife's shaved pussy, and when Allison starts to suck his cock as she's being fingered, Vivian knowingly asks her, "You've been waiting for this, haven't you?" Soon Adam joins the three of them and there are three groups going at each other throughout the loft. On the couch next to them there's a couple, while upstairs there's a four-way with some double penetration.

The next morning at home, Will and Allison almost can't believe it all really happened. In a complete turnaround from their earlier quickie together, the sex they have while talking about their first swinging experience is an erotic revelation. You can tell it's the best sex they've had alone together in a while, maybe ever.

Allison and Will are desperate to find Vivian and Adam again. They return to the restaurant and ask the waiter if he can get them in touch with the couple, and he writes something on the back of a business card that he says could help them. After searching a website called Lifestyle Lounge, Will and Allison can't find Adam and Vivian. It's only by a freak coincidence that Vivian happens to be the client that Allison has to meet at work to go over some contracts. Vivian invites Allison to come by her studio because she's interested in photographing her. Oh, there are a few photos involved, but Vivian just happens to keep a vibrator and lube in her studio, which enables the girls to have some very hot girl-on-girl time. Afterward, Will is almost ready to ravage his wife right there in the restaurant as she describes what she and Vivian did.

Vivian and Adam invite Allison and Will to a huge party for swingers. You might recognize the building as they enter – it's the San Francisco National Guard Armory and Arsenal, gorgeously lit up at night. Kink.com bought the building in 2007 and turned it into their headquarters and studio. Of course, you'll be more interested in the interior scenery, which involves plenty of familiar adult performers and real-life swingers recruited from the real Lifestyle Lounge website, already having fun as the two couples enter the party. The real swingers in the film may be amateurs in the adult industry but they clearly know what they're doing. Some are wearing masquerade masks, adding even more spice to the proceedings. The voyeuristic elements of this massive orgy scene take it over the top – you'll wish you were one of those people in the background watching Allison, Adam, and Tia Ling in a very hot threesome, because you could then join in the fun just like Wolf Hudson does, making it a foursome. Other performers you might recognize in the throngs of fuckers packed in this movie include Tara Lynn Fox and Jade Indica.

First-time director Ilana Rothman is a film school graduate who previously shot documentary footage for BehindKink.com at the Kink.com headquarters. Gorgeously filmed, "An Open Invitation" is the kind of movie that even couples who don't usually watch porn together can enjoy. The women and men are sexy, the situations are believable, and you'll feel like you're entering this bold new world right alongside Will and Allison. It's an excellent stimulant for experienced and would-be swingers alike. By the time you get to the proverbial and literal climax with the orgy scene at the end, newbies will be far too aroused to be intimidated by the prospect of so many naked, writhing, ecstatic bodies. It's almost as good as being there yourself.